Business Segments - Business Segment Net Sales and (Loss) Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from External Customer [Line Items]
Net sales	$ 96,166	$ 102,218	$ 317,369	$ 314,232
(Loss) income before income taxes:	(818)	1,311	845	3,757
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	96,166	102,218	317,369	314,232
(Loss) income before income taxes:	5,590	4,904	17,683	16,962
Operating Segments [Member] | Forged and Cast Mill Rolls [Member]
Revenue from External Customer [Line Items]
Net sales	63,833	68,325	209,876	213,027
Operating Segments [Member] | FEP [Member]
Revenue from External Customer [Line Items]
Net sales	3,370	5,300	10,229	14,977
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	67,203	73,625	220,105	228,004
(Loss) income before income taxes:	2,456	1,448	9,393	7,576
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	28,963	28,593	97,264	86,228
(Loss) income before income taxes:	3,134	3,456	8,290	9,386
Operating Segments [Member] | Air Handling Systems [Member]
Revenue from External Customer [Line Items]
Net sales	8,853	9,357	35,406	27,453
Operating Segments [Member] | Heat Exchange Coils [Member]
Revenue from External Customer [Line Items]
Net sales	10,824	10,068	33,626	31,808
Operating Segments [Member] | Centrifugal Pumps [Member]
Revenue from External Customer [Line Items]
Net sales	9,286	9,168	28,232	26,967
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
(Loss) income before income taxes:	$ (6,408)	$ (3,593)	$ (16,838)	$ (13,205)